Crossword Genius

Device in movies whereby a sudden intervention resolves a plotline (4,2,7)

Ross

I believe the answer is:

deus ex machina

(Other definitions for deus ex machina that I've seen before include "Late delivery" , "An unlikely solution" , "Unexpected problem solver" , "Happy-ending contrivance (Lat.)" , "Contrived agent who unexpectedly solves the insoluble" .)

I've seen this clue in The Guardian.
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